title: Electrocatalytic detection of phenolic estrogenic compounds at NiTPPS|carbon nanotube composite electrodes.
abstract: A Ni(II)tetrakis(4-sulfonatophenyl) porphyrin (NiTPPS)|carbon nanotube composite electrode that shows strong catalytic and antifouling capability was developed to detect a series of phenolic endocrine compounds including bisphenol A, nonylphenol and ethynylestradiol. This electrode was fabricated by electropolymerizing NiTPPS complexes on a carbon nanotube-modified glassy carbon electrode. Optimized experimental parameters including a hydrodynamic potential of 0.7 V for flow injection analysis (FIA) and a NiTPPS surface coverage of 2.2 nmol cm(-2) (standard deviation 0.2 nmol cm(-2); n=6) were obtained for detection of the endocrine disrupting compounds. The sensor responded well to all the tested compounds with limits of detection ranging from 15 nmol L(-1) to 260 nmol L(-1) (based on three times S/N ratio) under FIA conditions. Both carbon nanotubes and NiTPPS account for the excellent performance of the composite modified electrode.
authors.affiliation: Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, PR China.
authors.forename: Xiaoqiang
authors.initials: X
authors.lastname: Liu
authors.forename: Heqing
authors.initials: H
authors.lastname: Feng
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Liu
authors.forename: Danny K Y
authors.initials: DK
authors.lastname: Wong
mesh_terms: D001559:Benzhydryl Compounds; D002384:Catalysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D004997:Ethinyl Estradiol / Q000032:analysis*; D017022:Flow Injection Analysis / Q000379:methods; D008665:Metalloporphyrins / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D004997:Ethinyl Estradiol; D008665:Metalloporphyrins; D037742:Nanotubes, Carbon; D010636:Phenols; C025256:nonylphenol; C006780:bisphenol A; D000098826:Bisphenol A Compounds